Presser-foot mechanism for sewing-machines.



H. CORR/ILL & A. LESLIE.

FRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAY 23, I916.

Patented Dec. 17, 1918.

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HERBERT coRRALL, orfnEtEnsBUR GH, A D ALFRED LESLIE, F GLASGOW, SCOTLAND, ASSIGNORS TO'THE SINGE e v rAorURINecoMPANY, A CORPORATION or NEW J RS Y-a and Ammo LEsLIE, subjects of the King of the United Kingdom of Great Britain-and Ireland, residing, respectively, at Parkview, Helensburgh, Dumbartonshire, Scotland, and Glasgow, Scotland, have invented certain 'new and useful Improvements in Presser '-v Foot Mechanisms for Sewing Machines, ofwhich the following is a specification; e en beifi ad erein t the r.

ee e id w n j-,;,

This invention relates to presser-foot mechanism for sewing machines and more particularly to presser-foot mechanism of the rearwardlyvibrating type, wherein the resser-foot is mounted so as to be: free to a move with the feeddogiin the direction of feed and is returned to initialposition bv'a spring" as .the presser-fo'ot .is automatically lifted preparatory to the next feeding movement; a, Y

' one of as:that or-anaemia is to provideaconstruction of vibrating pressen foot'mechanism which will'a'voidthe drag on the workproduc'ed by similar devices heretofore .;.used, I while I maintaining the pressersfoot in fixed'angularrelation to they usual feed-(10g. Another Object Of-the c 30 vention isto provide a v'ibrating'presser-foot mechanism better adaptedfor '.running at high speed thanconstructions"heretofore in use and comprising a minimumnnumber' of working parts.

vTo this end the presser -footicarrier, which sustained by tl1e lower end of the usual spring-pressed .pr'esser-bar, is. mounted for tr'ansla'tory movement relatively to .the prcsser-bar in a path which-.ls upwardly curved in the direction-of feed; the, purpose being to cause the downward thrust of the presser-bar'fto exert aforce on theresser- 1 footcarrier tending to more thelatter in the direction of feed, without inclin ng the operat'ive face of the presserfoot I r I 3 In the "preferred embod ment of the invenby theusual sprin -pressed presser-bar. The carrier'shave upwardly I 1 ne d 1 opposed meeting m sses-F601 MECHANISM FOR SEWING-MACHINES. o

' Specification of Letters 3atent; jPatentd Application filed Ma'y 23, 1916. Serial No. 99,285.,

Be it known that 'we, HERBERT CORRALLv surfaces which are, initiallydrawn into contact relation by a tension sprlng connected at opposite ends to "the respective carriers;

In the initial position'of the parts the ,parallel links are verticallydisposed, so that the downward thrust of the presser-bar exerts no rearward thrust on the movable presserfoot carrier, that is to say, the presser-foot Dec. 17, 1918.

may lee-considered "as locked against rear-- ward movementwdue tothedownward pres-- sure of the presser-bar spring. 'Anin-i'tial; displacement of theEmOVable'carrierin thev direction of .feed, however, wi111 cause --the downward thrustof the presser-b'ar to exert a rearward thruston the movrblerarrier, V

which will increase with the displacement. This increasing rearward thrust'is very de sirable in overcoming the constantly increasmg reaction of the usual returnspring. On

account of the parallel-connection the motionof the I presserfoot is strictly translatory;

angular turning-movements thereof being,

eliminated." I

r In the accompanying drawings forming a part of this specification, the figure represents 'an end elevation of asewing machine head showing the usual needle and presserbars and-the improved presser-foot mecha-- t In the preferred embodiment of the in-' vention, 'as illustrated; the usual-sewing manism sustained in operative relation there-j chine head l is providedwith bearings for i the needle-barQ towhich is securedthe lat-' eral stud 3 embraced by one end of a'pitman 4:, the otherfend of which embraces the crank-pin 5 on the crank-disk 6 carried as usual by the main-shaft. The presser-bar 7 journaled in parallel relation to the needlei bar, carries a collar 8, between which and the frame the usual compression spring 9 is located. Any oftheTusual. types of auto= matically operated :presser-bar :lifting de vices ay ,be .empld 'ea to lift the'presscr-I foot duringtheQreturnstroke of the feed:

dog. For example'a can] l2f'on'the crankdiskfi maybe provided-to lift a slide-bar13 carrying alateral arm 14 arranged to engage u'ndera clutch-collar 1-5 surrounding-Atlas;

presser-bar in ,a manner dwell-l mownlf The" cam 12 .is 'so' situated that itivilllift the presser ba'r while the needle'is iii-the work,- at'which time the usualfeed-dog'is execute ing its return, movement below. the throat; plate. o

The pressei' -foot 16 is seeured by a sqrew 17 to a pin 18 projecting downwardly from' the movable pre s'serfoot 'carnier 1-9 inwhieh are mounted the transverse pins 20 embraced" by thelower ends of a painof parallel links v 21 ofequal length, the 'uppenends of' which embrace transverse pins22 sustained by the laterally 'fixed' carrier 23" mounfid" on the presser-bar 7. The carriers-I9 and: 2-3ehavez: opposed, upwardly and rearwardly inelined meeting" surfaces 19 and 23" respectively,-.

- initially held in coi1taeting relatiembya clinati-on-i o-fi the: pathi inei easing with inclined path along the are (it-a c t le spring 24;, in which positionthe links 21 are} disposed at right angles. to; the direction of feed. It wilib'e noted that the movable carrier 19 will remain parallel to the fixed carrier 23 any of the positions itmayas= sume and it wiH be further noted that the pnesserfoo'ti 16 Will?- movean; upwardi iy .a' e

. a e1 rearward; displacement of thef mdvable ea-1::

a view Thelinks-2mmey -tlietefiore ered as guiding means: which; detetmineathe path-t tizanslatoryv movementiof the eeri rier 1:9: felli'tiv' tfi-th earlier 23 me nmcew 30 v a a,

the-presser -bar y i In the operation fifths-device whem the usual? fem-de 25 moves inte e entarct with the; work; shown-011 the (sewing; i-fis ini'' displace the lower ends ofthe linksflllfreafi wand'ly'g thus permitting 5 the downward thrust of the pressjenben spring 9 my exerti a constantly-increasing -fearwardiy dircfi ed ifo'reeupon themovahi" :arrien which 'Wi-Iii balance or" overcome. tiiefeonstantl y increase ing' reaction at the sprin'gfiwaswell asthe:

inertia of the moving parts and thesl-ii t friction at theemisi'of the linlis l he Work engaging face; of the IGSSBFfOOt will also remain constantly in 'x'ed angular-re lation to the presser=15ar and therefore in para-lieli'sme with the feed d'bg,vvith the. re? suit that" the WOI'k' will be: uniformly conupressecf throughout the feedingstroke;

Having thus set forth thenatureofthe.

invention what we claim herein is 15131- a sewing machine: the combination with aspning -pressei pressenbaig; automaticz lifting means therefor, a feed dogt a, nresser; font opposed to.isaidfeed d og',1and pivotal-1y. silppnrted on said" prefsse -ba'r, thex pathe (iiiv movement ofsaiii fbotbeing in w; piane parailieftb feegT- dog-during ithe work-feed? m-g operation;wherebythefmovmefitoflfhj press'erfliar assists; the ff'df-diig advanting: the worlli V v i s. v i

2': a; sewing, machine; in eomhiimti'omj a feed dog; a springgpre'ssed presser-bat an tomatie' lifting eans therefbr," a res es foot," '2: plvet'a'l mounting. for sai-d p'resser-' foot carried by said resser-baa:v and. guid ing supporting, and sustainingthe presser- I fogtmovably in an upwardly mclineci path relatively to the Presser-bar, and with its operative face-infixedfanguiarre'lationwith said presser-bairi' I y 3. In a sewing machine the combination With'a presser-baf, a spring for depressing and -automatic means for lifting the same. a Work-support, a feed-dog, a presser fooficafi ri'ed by-thesaidbar', sald presser-foot being supported upon the resser-bar for movement rearwardl yf aplane =para11e1' tothe work-support; Inching means for the resserfootacting to hol'd the 1a-tter* ,aga;instrearward movementrunder "the action of the presser bar s ringuntiii released bythetea-r wardife'ed o the-fabricunder theaction of the feeki-d'oggamimeansfbr restoring the presseif -foofitofol-Want position.

In; a sewing machine; combinatien,

devices for mountingjytit'e fatter nponfisait presen -Evan f0? rearward? movement m a a a psesg ebar, a spring for depressing emf irieans for" Iiftfizug the-seam, a; resser tout-a,

means'f'fof'restormgr saiif px zesser -feot tirinie tialflpqsitien releaseofpressuregl--the devmf V fin;1moiniti'nggythep ref s'ser foot upqm the ressei -bamqmgrising I lleif l'iscffll" trains lnifltnig' tie press! Inez; ofithespriirg to the? ofthe letter; means Iteing-- aaapwew tt ei m sewing-i mental-e; cbmhinatigi'nj act only after an initial rearward movement er v e iii w ng 'fii ss and? means for H tti g the am i P ss -z foot mountevf" on said p -i I' rm war-rt nmyernent a'lbng'. i W 5 v c r 1? Wardiy' relatively to; saiiifpres'sei bmf; where= by the; pressureaf'seigi? spring: wiHi temf-to displace the piiesser foot rearwarcfly with ldingly notdiii g ;said messen- "ositfom j ggmechine;trieicemfiinatioit with; a; teezi'fdbg; a springp essed? liftingmeaus therefb'r, of spacdi pamllelilinks'carfieafny saidi' resser-bar, a nes'serrfeet, susteiiiidl, saiag liiilis', means for determining the initial position (if said press en- Bar; andf xa laizive to said pre'ssei' bar, s'a'id Ada-mes to th sspecification, in the presencsof inks being disposed substantially at; right "two subscribing witnesseaf 1 angles to theidirection of feed when the HERBERT CORRALL.- resser -'foot is in initial position," and a I ALFRED LESLIE;

fe sser-foot 5 spring for returning said resser-foot to ini- Y 'WitneSs I tial posit on after a feeding movement. WAnL cE CRANSTON Famwm'rmm,

In testimony whereof we have slgned our Hmmy MASON.

copies of thin patent may be obtained tbr five cents euhybfaddfufln: the Gomminianer of but,

Washington, D. 0. 

